<template>
  <div class="page">
    <pw-section class="blue" label="Request" ref="request">
      <ul>
        <li>
          <label for="url">URL</label>
          <input
            id="url"
            type="url"
            :class="{ error: !urlValid }"
            v-model="url"
            @keyup.enter="urlValid ? toggleConnection() : null"
          />
        </li>
        <li>
          <label for="connect" class="hide-on-small-screen">&nbsp;</label>
          <button :disabled="!urlValid" id="connect" name="connect" @click="toggleConnection">
            {{ toggleConnectionVerb }}
            <span>
              <i class="material-icons" v-if="!connectionState">sync</i>
              <i class="material-icons" v-if="connectionState">sync_disabled</i>
            </span>
          </button>
        </li>
      </ul>
    </pw-section>

    <br />

    <pw-section class="purple" label="Communication" id="response" ref="response">
      <ul>
        <li>
          <label for="log">Log</label>
          <div id="log" name="log" class="log">
            <span v-if="communication.log">
              <span
                v-for="(logEntry, index) in communication.log"
                :style="{ color: logEntry.color }"
                :key="index"
              >@ {{ logEntry.ts }} {{ getSourcePrefix(logEntry.source) }} {{ logEntry.payload }}</span>
            </span>
            <span v-else>(waiting for connection)</span>
          </div>
        </li>
      </ul>
      <ul>
        <li>
          <label for="message">Message</label>
          <input
            id="message"
            name="message"
            type="text"
            v-model="communication.input"
            :readonly="!connectionState"
            @keyup.enter="connectionState ? sendMessage() : null"
          />
        </li>
        <li>
          <label for="send" class="hide-on-small-screen">&nbsp;</label>
          <button id="send" name="send" :disabled="!connectionState" @click="sendMessage">
            Send
            <span>
              <i class="material-icons">send</i>
            </span>
          </button>
        </li>
      </ul>
    </pw-section>
  </div>
</template>
<style lang="scss">
div.log {
  margin: 4px;
  padding: 8px 16px;
  width: calc(100% - 8px);
  border-radius: 8px;
  background-color: var(--bg-dark-color);
  color: var(--fg-color);
  height: 256px;
  overflow: auto;

  &,
  span {
    font-size: 18px;
    font-family: "Roboto Mono", monospace;
  }

  span {
    display: block;
    white-space: pre-wrap;
  }
}
</style>

<script>
import section from "../components/section";
export default {
  components: {
    "pw-section": section
  },
  data() {
    return {
      connectionState: false,
      url: "wss://echo.websocket.org",
      socket: null,
      communication: {
        log: null,
        input: ""
      }
    };
  },
  computed: {
    toggleConnectionVerb() {
      return !this.connectionState ? "Connect" : "Disconnect";
    },
    urlValid() {
      const pattern = new RegExp(
        "^(wss?:\\/\\/)?" +
          "((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|" +
          "((\\d{1,3}\\.){3}\\d{1,3}))" +
          "(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*" +
          "(\\?[;&a-z\\d%_.~+=-]*)?" +
          "(\\#[-a-z\\d_]*)?$",
        "i"
      );
      return pattern.test(this.url);
    }
  },
  methods: {
    toggleConnection() {
      // If it is connecting:
      if (!this.connectionState) return this.connect();
      // Otherwise, it's disconnecting.
      else return this.disconnect();
    },
    connect() {
      this.communication.log = [
        {
          payload: `Connecting to ${this.url}...`,
          source: "info",
          color: "var(--ac-color)"
        }
      ];
      try {
        this.socket = new WebSocket(this.url);
        this.socket.onopen = event => {
          this.connectionState = true;
          this.communication.log = [
            {
              payload: `Connected to ${this.url}.`,
              source: "info",
              color: "var(--ac-color)",
              ts: new Date().toLocaleTimeString()
            }
          ];
          this.$toast.success("Connected", {
            icon: "sync"
          });
        };
        this.socket.onerror = event => {
          this.handleError();
        };
        this.socket.onclose = event => {
          this.connectionState = false;
          this.communication.log.push({
            payload: `Disconnected from ${this.url}.`,
            source: "info",
            color: "#ff5555",
            ts: new Date().toLocaleTimeString()
          });
          this.$toast.error("Disconnected", {
            icon: "sync_disabled"
          });
        };
        this.socket.onmessage = event => {
          this.communication.log.push({
            payload: event.data,
            source: "server",
            ts: new Date().toLocaleTimeString()
          });
        };
      } catch (ex) {
        this.handleError(ex);
        this.$toast.error("Something went wrong!", {
          icon: "error"
        });
      }
    },
    disconnect() {
      if (this.socket != null) this.socket.close();
    },
    handleError(error) {
      this.disconnect();
      this.connectionState = false;
      this.communication.log.push({
        payload: `An error has occurred.`,
        source: "info",
        color: "#ff5555",
        ts: new Date().toLocaleTimeString()
      });
      if (error != null)
        this.communication.log.push({
          payload: error,
          source: "info",
          color: "#ff5555",
          ts: new Date().toLocaleTimeString()
        });
    },
    sendMessage() {
      const message = this.communication.input;
      this.socket.send(message);
      this.communication.log.push({
        payload: message,
        source: "client",
        ts: new Date().toLocaleTimeString()
      });
      this.communication.input = "";
    },
    collapse({ target }) {
      const el = target.parentNode.className;
      document.getElementsByClassName(el)[0].classList.toggle("hidden");
    },
    getSourcePrefix(source) {
      const sourceEmojis = {
        // Source used for info messages.
        info: "\tℹ️ [INFO]:\t",
        // Source used for client to server messages.
        client: "\t👽 [SENT]:\t",
        // Source used for server to client messages.
        server: "\t📥 [RECEIVED]:\t"
      };
      if (Object.keys(sourceEmojis).includes(source))
        return sourceEmojis[source];
      return "";
    }
  },
  updated: function() {
    this.$nextTick(function() {
      var divLog = document.getElementById("log");
      divLog.scrollBy(0, divLog.scrollHeight + 100);
    });
  }
};
</script>
